oefening 4 + 5 loops

loops/oefening4.js

@@ -0,0 +1,26 @@
+const input = require('readline-sync');
+
+let fuelLevel = 0, numAstronauts = 0, altitude = 0;
+
+while (fuelLevel <= 5000 || fuelLevel >= 30_000 || isNaN(fuelLevel)) {
+	fuelLevel = input.question('Enter the starting fuel level: ')
+}
+
+console.log('Starting fuel level: ' + fuelLevel);
+
+while (numAstronauts < 1 || numAstronauts > 7 || isNaN(numAstronauts)) {
+	numAstronauts = input.question("Enter the number of astronauts: ")
+}
+
+while (fuelLevel - 100 * numAstronauts >= 0) {
+	altitude += 50;
+	fuelLevel -= 100 * numAstronauts;
+}
+
+console.log('The shuttle gained an altitude of ' + altitude + ' km.');
+
+if (altitude >= 2000) {
+	console.log('Orbit achieved!');
+} else {
+	console.log('Failed to reach orbit.');
+}